All we know is that the Phillies catcher, who has had a prominent role because of Carlos Ruiz's absences (restricted list and DL), has a medial meniscus tear in his left knee that will require surgery.

The team annouced that his recovery time will not be known until after his surgery.

Kratz, who turns 33 on June 15, is hitting .229 with eight home runs (one off his career high) and 22 RBIs (four off his career high) in 43 games.